Abstract
US, CT and MRI findings of autoimmune pancreatitis (AIP) were described based on "Clinical diagnostic criteria of autoimmune pancreatitis 2006". Evaluation of the enlargement of the pancreas, either diffuse or localized, is the essential point by imaging studies. However, other characteristic imaging findings are also required in order to obtain a correct diagnosis. On US, hypoechoic pancreatic enlargement is characteristic to AIP. On dynamic study, either on CT or on MRI, AIP usually shows a delayed enhancement pattern. Signal intensity on T1-weighted MRI usually decreased, however it varies on T2-weighted image. Attention should be paid to the fact that there are various imaging findings of AIP, probably due to the disease condition. At present, MRCP cannot be used in evaluating main pancreatic duct narrowing; however, it might be used in the near feature based on advances in image quality.
